Scortatory love means the love of adultery which destroys conjugial love (as stated in 423 above). There is no need to prove that the nature of scortatory love cannot be known without knowing the nature of conjugial love; it need only be illustrated by comparisons. For instance, can anyone know what evil and falsity are, unless he knows what good and truth are? Can anyone know what unchastity, dishonesty, impropriety and unloveliness are, unless he knows what chastity, honesty, propriety and loveliness are? Can anyone discern follies, unless he is wise or knows what wisdom is? Again, can anyone properly perceive inharmonious squeaks, unless he has been taught and has studied what harmonies are? Likewise, can anyone perceive the nature of adultery, unless he has perceived that of marriage? And can anyone submit to his judgment the filth of the pleasures of scortatory love, unless he has first submitted to his judgment the cleanliness of conjugial love? Since I have now finished describing the delights of wisdom concerning conjugial love, I can use the understanding acquired from this to describe the pleasures concerning scortatory love.